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Comparative study of sediment erosion on alternative designs of Francis runner blade
Rajkarnikar, Bidhan,Neopane, Hari P.,Thapa, Biraj S. Korean Society for Fluid machinery 2015 International journal of fluid machinery and syste Vol.8 No.3
The aim of this study was comparative analysis of sediment-induced erosion on optimized design and traditional design of Francis runner blade. The analysis was conducted through laboratory experiments in a test rig called Rotating Disc Apparatus. The results showed that the extent of erosion was significantly less in the optimized design when compared based on the material loss. It was observed that the optimized design could reduce sediment erosion by about 14.4% if it was used in place of the reference design for entire duration of the experiment. Based on the observations and results obtained, it has been concluded that the optimization of hydraulic design of blade profile of Francis runner can significantly reduce the effect of sediment-induced erosion.
Computational Design of Bifurcation: A Case Study of Darundi Khola Hydropower Project
Koirala, Ravi,Chitrakar, Sailesh,Neopane, Hari Prasad,Chhetri, Balendra,Thapa, Bhola Korean Society for Fluid machinery 2017 International journal of fluid machinery and syste Vol.10 No.1
Bifurcation refers to wye division of penstock to divide the flow symmetrically or unsymmetrically into two units of turbine for maintaining economical, technical and geological substrates. Particularly, water shows irrelevant behavior when there is a sudden change in flow direction, which results into the transition of the static and dynamic behavior of the flow. Hence, special care and design considerations are required both hydraulically and structurally. The transition induced losses and extra stresses are major features to be examined. The research on design and analysis of bifurcation is one of the oldest topics related to R&D of hydro-mechanical components for hydropower plants. As far as the earlier approaches are concerned, the hydraulic designs were performed based on graphical data sheet, head loss considerations and the mechanical analysis through simplified beam approach. In this paper, the multi prospect approach for design of Bifurcation, incorporating the modern day's tools and technology is identified. The hydraulic design of bifurcation is a major function of dynamic characteristics of the flow, which is performed with CFD analysis for minimum losses and better hydraulic performances. Additionally, for the mechanical design, a simplified conventional design method as pre-estimation and Finite Element Method for a relevant result projections were used.
Comparative study of sediment erosion on alternative designs of Francis runner blade
Bidhan Rajkarnikar,Hari P. Neopane,Biraj S. Thapa 한국유체기계학회 2015 International journal of fluid machinery and syste Vol.8 No.3
The aim of this study was comparative analysis of sediment-induced erosion on optimized design and traditional design of Francis runner blade. The analysis was conducted through laboratory experiments in a test rig called Rotating Disc Apparatus. The results showed that the extent of erosion was significantly less in the optimized design when compared based on the material loss. It was observed that the optimized design could reduce sediment erosion by about 14.4% if it was used in place of the reference design for entire duration of the experiment. Based on the observations and results obtained, it has been concluded that the optimization of hydraulic design of blade profile of Francis runner can significantly reduce the effect of sediment-induced erosion.
( Rojeet Shrestha ),( Suraj Parajuli ),( Puja Neopane ),( Madhav Khanal ),( Sunil C Jha ),( Bharat Jha ) 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1
Aims: The presence of multiple metabolic disorders such as diabetes mellitus, obesity, dyslipidemia, and hypertension is associated with non-alcoholic liver disease (NAFLD) that can potentially progress to severe liver disease. Although the pathogenesis of NAFLD is poorly understood, there is a considerable amount of evidence that it is associated with abnormal lipid metabolism and dyslipidemia. Therefore, NAFLD not only increases the risk of advanced liver diseases but also associated with future coronary events. Hence, we aimed to examine the association Serum lipids, anti-oxidized-LDL Antibody (Anti-oxLDL Ab), and high-sensitivity C-reactive protein (hsCRP) in the metabolic syndrome (MetS) patients with and without elevated liver enzymes. Methods: A total of 82 individuals (male/female:35/47) with MetS as defined by NCEP ATP III, and 68 healthy control (male/ female:36/32), were recruited for this study. Fasting blood samples were analyzed for blood glucose, eGFR, lipid profile, liver function test (bilirubin, ALT, AST, ALP, γ-GT, LDH, albumin, globulin), anti-oxLDL Ab, and hsCRP. Urine samples were analyzed for albumin-creatinine ratio (UACR). Results: MetS is significantly associated with elevated serum ALT compared to control. 22.0%, 17.8% and 10.3% of individuals with MetS have elevated ALT, AST, and γ-GT, respectively. In contrast, only 6.0%, 4.7%, and 2.6% of healthy control have elevated ALT, AST, and γ-GT, respectively. Interestingly, we found significant elevation of anti-oxLDL Ab and hsCRP in MetS with elevated ALT compared to normal ALT level (38.7±24.7 vs 20.35±10.6 U/L, P<0.001 for anti-oxLDL Ab and 5.55±7.6 vs 2.15±1.2 mg/L, P<0.001 for hsCRP). No such association was observed with serum AST and γ-GT. In addition, the level of ALT is significantly correlated with anti-oxLDL Ab and hsCRP in the MetS with elevated ALT (P=0.021). Although the mean of serum triglyceride, total and LDL-cholesterol, UACR, and eGFR is significantly increased in MetS compared to controls, no such difference was observed between MetS with normal and elevated liver enzymes. Conclusions: MetS is associated with elevated liver enzymes. The individuals with MetS with elevated liver enzymes are associated with increase in hsCRP and anti-oxLDL Ab. The oxidative and inflammatory process might involved in progressive deterioration of liver functions in the MetS.
Baidar, Binaya,Chitrakar, Sailesh,Koirala, Ravi,Neopane, Hari Prasad Korean Society for Fluid machinery 2015 International journal of fluid machinery and syste Vol.8 No.4
The present study is conducted to identify a better design and optimal number of Francis runner blades for sediment laden high head micro hydropower site, Tara Khola in the Baglung district of Nepal. The runner is designed with in-house code and Computational Fluid Dynamics (CFD) analysis is performed to evaluate the performance with three configurations; 11, 13 and 17 numbers of runner blades. The three sets of runners were also investigated for the sediment erosion tendency. The runner with 13 blades shows better performance at design as well as in variable discharge conditions. 96.2% efficiency is obtained from the runner with 13 blades at the design point, and the runners with 17 and 11 blades have 88.25% and 76.63% efficiencies respectively. Further, the runner with 13 blades has better manufacturability than the runner with 17 blades as it has long and highly curved blade with small gaps between the blades, but it comes with 65% more erosion tendency than in the runner with 17 blades.